Download PDF by S.N. Antontsev, J.I. Diaz, S. Shmarev: Energy Methods for Free Boundary Problems: Applications to

By S.N. Antontsev, J.I. Diaz, S. Shmarev

ISBN-10: 1461200911

ISBN-13: 9781461200918

ISBN-10: 1461266076

ISBN-13: 9781461266075

For the prior numerous a long time, the learn of unfastened boundary difficulties has been a truly energetic topic of study happening in numerous technologies. What those difficulties have in universal is their formula by way of definitely posed preliminary and boundary price difficulties for nonlinear partial differential equations. Such difficulties come up, for instance, within the mathematical therapy of the methods of warmth conduction, filtration via porous media, flows of non-Newtonian fluids, boundary layers, chemical reactions, semiconductors, etc. The growing to be curiosity in those difficulties is mirrored by way of the sequence of conferences held below the name "Free Boundary difficulties: conception and functions" (Ox­ ford 1974, Pavia 1979, Durham 1978, Montecatini 1981, Maubuisson 1984, Irsee 1987, Montreal 1990, Toledo 1993, Zakopane 1995, Crete 1997, Chiba 1999). From the complaints of those conferences, we will be able to know about the several varieties of mathematical parts that fall in the scope of unfastened boundary difficulties. it truly is worthy pointing out that the ecu technology beginning supported an unlimited study undertaking on loose boundary difficulties from 1993 until eventually 1999. the new construction of the really good magazine Interfaces and loose obstacles: Modeling, research and Computation offers us an idea of the energy of the topic and its current nation of improvement. This booklet is as a result of the collaboration one of the authors over the past 15 years.

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Extra resources for Energy Methods for Free Boundary Problems: Applications to Nonlinear PDEs and Fluid Mechanics

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E ! E L(1+a)/a (Q), p' = p~I' W-m,p' (Q), or ! E £P' (Q») . Here W-m,p' (Q) denotes the dual space of W/{',p (Q). 11) where 11111 * = (either or II! II w-m ,p' ($1)' II! I ~t~a)/a (Q)' This estimate is derived by multiplying equation (6,1) by u ing by parts and applying the Young inequality. E W/{',P (Q), integrat- 54 1. 1. 12) holds. Before starting the presentation, let us stress that the energy method in the form used in Sections 1-3 fails in the case m > 1. This is because the integrals over the surface of the sphere Sp (xo) appearing after integration by parts depend now on derivatives of (2m - l)th order, while the energy function E only comprises derivatives of the orders not exceeding m - 1.

Vu :s E(O) + b(O) Then there exists Po == + luI1+a)dx < 00. po(Cj, C2, p, a, N, E(O» ~ supp u C G x (0, po). 30) 46 1. Localized Solutions of Nonlinear Stationary Problems Proof First, we establish the energy relation [ [ (A(X, u, Vu)· Vu Jp Jc + 1~I_a IU 11 +a ) aXN+l a + 1 dx + _a_ [ IB(y,p)lluI1+ady = _ [ AN+l(Y,P,U, Vu)udy:= 1 + a Jc Jc /(p). :s qVulltp(c) . :s 0, o whence the desired assertion. 5 Systems of second-order elliptic equations In this section we apply energy methods to the study of localization properties of solutions to systems of second-order elliptic equations.

Not entering into the details, let us illustrate this possibility by the following simple example. 21) inS1=(-l,l) 51 Systems of second-order elliptic equations with 0 < ai < 1. Later on, in Chapters 2 and 3, we shall discuss the questions of genesis of such systems and applicability of other methods to their study (see also [153]. 21). 22) _p IUxl dx, and assume that O::s Ui(X) ::s M < 00, a = max (a], a2) < 1. 21) by U] + AU2 and the second one by U2 + AU] with some A E (0,1/2), we obtain the energy relation iB[ (ufx + 2AU]x U2x + uL) dx + [ iB p Q(U], u2)dx := I.

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Energy Methods for Free Boundary Problems: Applications to Nonlinear PDEs and Fluid Mechanics by S.N. Antontsev, J.I. Diaz, S. Shmarev

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